CN217809018U - HPPO waste water and hydrogen peroxide solution waste water combined treatment system - Google Patents
HPPO waste water and hydrogen peroxide solution waste water combined treatment system Download PDFInfo
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Abstract
The disclosure relates to a combined treatment system for HPPO wastewater and hydrogen peroxide wastewater. The system comprises an HPPO wastewater pretreatment unit, a hydrogen peroxide wastewater pretreatment unit, and a mixed acid regulating unit (5), a catalytic reaction unit (6), an alkali adding neutralization unit (7) and a flocculation precipitation unit (8) which are sequentially communicated; wherein the mixed acid regulating unit comprises an HPPO wastewater inlet (H3) and a hydrogen peroxide wastewater inlet (H4); the HPPO wastewater inlet is communicated with the HPPO wastewater outlet of the HPPO wastewater pretreatment unit, and the hydrogen peroxide wastewater inlet is communicated with the hydrogen peroxide wastewater outlet of the hydrogen peroxide wastewater pretreatment unit. The system jointly uses the HPPO wastewater and the hydrogen peroxide wastewater, can reduce a part of organic pollutants, improves the biodegradability of the wastewater, and can also greatly reduce the concentration of peroxide in the hydrogen peroxide wastewater, thereby realizing the treatment of waste by waste and meeting the requirement of entering a sewage treatment plant.
Description
Technical Field
The disclosure relates to a chemical wastewater treatment device, in particular to a combined treatment system for HPPO wastewater and hydrogen peroxide wastewater.
Background
Propylene Oxide (PO) is an important propylene derivative, is an additive substance of various materials in industrial production, is widely used for automobile manufacturing and household articles, is an important propylene derivative, is an additive substance of various materials in industrial production, and is widely used in the fields of automobile manufacturing, household articles, food and medicine, building, even aerospace and the like.
The HPPO process is green and environment-friendly, but the wastewater generated by the HPPO device contains refractory organics and toxic and harmful substances, has extremely poor biodegradability and brings great difficulty to environmental management; meanwhile, the wastewater generated by the hydrogen peroxide device matched with the HPPO contains residual hydrogen peroxide, heavy aromatics and other substances, and the hydrogen peroxide wastewater can not be directly discharged into a sewage treatment plant because the wastewater contains high-concentration peroxide which can cause serious damage to a microbial system. Therefore, the HPPO process wastewater and the hydrogen peroxide process wastewater can enter the existing sewage treatment plant of an enterprise only through proper pretreatment.
For example, patent CN201810167061.5, it performs multi-stage azeotropic distillation on organic matter-containing wastewater and entrainer, so as to recover heavy components such as propylene glycol and propylene glycol derivatives in the wastewater, and at the same time, it reduces the difficulty of wastewater treatment, and provides possibility for biochemical treatment of wastewater and recovery of corresponding by-products.
The invention relates to the field of wastewater treatment, in particular to a pretreatment method for hydrogen peroxide wastewater produced by an anthraquinone process, and provides CN 202110008628.6; the method comprises the following steps: phosphorus removal reaction, precipitation, catalytic oxidation reaction, pH value adjustment and the like, firstly adding a precipitator calcium salt to precipitate phosphorus salt in wastewater, then adding ferrite ions by utilizing a small amount of hydrogen peroxide contained in the wastewater, efficiently removing organic pollutants contained in the wastewater under the action of a catalyst, and converting generated iron ions into ferric hydroxide precipitate through final pH value adjustment to play a role in flocculating pollutants and further purifying the sewage; the method aims at the characteristics of wastewater produced by hydrogen peroxide through an anthraquinone process, and can be used for pretreating the wastewater by utilizing the existing conditions, so that conditions can be created for the subsequent treatment of the wastewater, and the treatment cost is reduced.
Patent CN205974092U discloses hydrogen peroxide solution waste water preliminary treatment dephosphorization and organic matter device, including hydrogen peroxide solution waste water collecting tank, ferrous sulfate groove, high concentration waste water collecting tank, first reaction tank, second reaction tank, third reaction tank, fourth reaction tank, first sedimentation tank, second sedimentation tank and waste liquid alkali groove, the leading-in of waste water pipeline that high concentration waste water collecting tank inlet is connected comes from hydrogen peroxide solution workshop carclazyte regeneration or catalyst regeneration waste water.
However, the existing wastewater treatment device still has the defects of complex equipment construction, low pollutant removal rate and poor pollutant pertinence.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a HPPO waste water and hydrogen peroxide solution waste water combined treatment system, this system jointly uses HPPO waste water and hydrogen peroxide solution waste water, can cut down partly organic pollutant, has promoted waste water biodegradability, can also reduce peroxide concentration in the hydrogen peroxide solution waste water by a wide margin in addition, realizes "treating waste with waste", reaches the requirement of getting into sewage treatment plant.
In order to achieve the purpose, the present disclosure provides a combined treatment system for HPPO wastewater and hydrogen peroxide wastewater, which comprises a HPPO wastewater pretreatment unit, a hydrogen peroxide wastewater pretreatment unit, and a mixed acid adjusting unit, a catalytic reaction unit, an alkali adding neutralization unit and a flocculation precipitation unit which are sequentially communicated; the mixed acid regulating unit comprises an HPPO wastewater inlet and a hydrogen peroxide wastewater inlet; the HPPO wastewater inlet is communicated with an HPPO wastewater outlet of the HPPO wastewater pretreatment unit, and the hydrogen peroxide wastewater inlet is communicated with a hydrogen peroxide wastewater outlet of the hydrogen peroxide wastewater pretreatment unit.
Optionally, the hydrogen peroxide wastewater pretreatment unit comprises a first homogenizing tank, a first oil separation device and a second oil separation device which are sequentially communicated; the first homogenizing tank is provided with a hydrogen peroxide wastewater raw material inlet which is used for being communicated with a hydrogen peroxide wastewater source; the second oil separation device is provided with a hydrogen peroxide wastewater pretreatment outlet so as to form a hydrogen peroxide wastewater outlet of the hydrogen peroxide wastewater pretreatment unit.
Optionally, the HPPO wastewater pretreatment unit comprises a second homogenization tank; the second homogenizing tank is provided with an HPPO wastewater raw material inlet and an HPPO wastewater pretreatment outlet, the HPPO wastewater raw material inlet is used for being communicated with an HPPO wastewater raw material source, and the HPPO wastewater pretreatment outlet is formed as an HPPO wastewater outlet of the HPPO wastewater pretreatment unit.
Optionally, the first oil separation device is an oil separation tank, and a first sludge discharge port is formed in the bottom of the oil separation tank; the second oil separation device is an air floatation oil removal device, and a second sludge discharge port is formed in the upper part of the air floatation oil removal device; the air floatation oil removal device is selected from one or more of a cavitation air floatation device and a dissolved air floatation device.
Optionally, the first oil removal device and the second oil removal device each independently comprise an oil removal assisting device; the oil removal auxiliary device comprises one or more of an air compressor, a booster pump and an oil scraper.
Optionally, the mixed acid adjusting unit further comprises a first wastewater outlet; the catalytic reaction unit comprises a first wastewater inlet and a second wastewater outlet; the first wastewater inlet is communicated with the first wastewater outlet of the mixed acid regulating unit; the alkali-adding neutralization unit comprises a second wastewater inlet and a third wastewater outlet; the second wastewater inlet is communicated with the second wastewater outlet of the catalytic reaction unit; the flocculation precipitation unit comprises a third waste water inlet and a treated waste water outlet; the third waste water inlet is communicated with a third waste water outlet of the alkali-adding neutralization unit; the treated wastewater outlet is communicated with a biochemical treatment device.
Optionally, the mixing and acid-adjusting unit further comprises an acid liquor dosing port, a first pH detection device, a first dosing device and a first stirring device; the probe of the first pH detection device is arranged in the mixed acid regulating unit and used for detecting the pH value of liquid in the mixed acid regulating unit; the first medicine adding device is in signal connection with the first pH detection device and is used for adding acid into the mixed acid regulating unit through the acid liquor adding port according to the pH value detected by the first pH detection device; the first stirring device is arranged inside the mixing and acid-regulating unit.
Optionally, the catalytic reaction unit further comprises a catalyst dosing inlet, a medicament dissolving tank, a second dosing device and a second stirring device; the second dosing device is used for dosing an oxidant to the medicament dissolving tank according to the amount of the hydrogen peroxide wastewater introduced into the catalytic reaction unit; the medicament dissolving tank is arranged inside the catalytic reaction unit; the second stirring device is arranged inside the catalytic reaction unit; the second stirring device is selected from one or more of a hydraulic stirring device, a mechanical stirring device and an air stirring device.
Optionally, the alkali adding and neutralizing unit further comprises an alkali adding opening, an alkali dissolving tank, a second pH detecting device and a third adding device; the probe of the second pH detection device is arranged in the alkali-adding neutralization unit and is used for detecting the pH value of liquid in the alkali-adding neutralization unit; the third dosing device is in signal connection with the second pH detection device and is used for adding alkali into the alkali adding neutralization unit through the alkali dosing port according to the pH value detected by the second pH detection device.
Optionally, the flocculation precipitation unit further comprises a precipitation aid dosing port and a third sludge discharge port; the third sludge discharge port is arranged at the bottom of the flocculation precipitation unit; and the top of the flocculation precipitation unit is also provided with an overflow weir to form the treated wastewater outlet.
Through the technical scheme, the utility model provides a HPPO waste water and hydrogen peroxide solution waste water combined treatment system, mix HPPO waste water and hydrogen peroxide solution waste water, utilize the peroxide in the hydrogen peroxide solution waste water to carry out catalytic oxidation under the acid catalysis condition, both can eliminate the organic matter in the HPPO waste water, promote waste water biodegradability, peroxide concentration in the hydrogen peroxide solution waste water has still been reduced by a wide margin, reach the purpose of "treating waste with waste", the waste water that obtains through the combined treatment satisfies the requirement that gets into sewage treatment plant, and has good economic benefits, the expense at sewage treatment station is reduced by a wide margin.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is an exemplary schematic diagram of a combined treatment system for HPPO wastewater and hydrogen peroxide wastewater provided by the present disclosure.
Description of the reference numerals
1-a first homogenizing tank, 2-a first oil separation device, 3-a second oil separation device, 4-a second homogenizing tank, 5-a mixed acid adjusting unit, 6-a catalytic reaction unit, 7-an alkali adding neutralization unit and 8-a flocculation precipitation unit;
w1-hydrogen peroxide wastewater, an S1-hydrogen peroxide wastewater raw material inlet, an S2-water outlet, an S3-water inlet, an S4-hydrogen peroxide wastewater pretreatment outlet, a P1-first sludge discharge port and a P2-second sludge discharge port;
W2-HPPO wastewater, an H1-HPPO wastewater raw material inlet, an H2-HPPO wastewater pretreatment outlet, an H3-HPPO wastewater inlet, an H4-hydrogen peroxide wastewater inlet, a Y1-acid liquor dosing port, an H5-first wastewater outlet, an H6-first wastewater inlet, an H7-second wastewater outlet, Y2-catalyst feeding inlet, H8-second wastewater inlet, H9-third wastewater outlet, Y3-alkali feeding port, H10-third wastewater inlet, H11-treated wastewater outlet, Y4-precipitation auxiliary agent feeding port, P3-third sludge outlet, and W3-effluent
Detailed Description
The following detailed description of the embodiments of the disclosure refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
The present disclosure provides a combined treatment system for HPPO wastewater and hydrogen peroxide wastewater, as shown in fig. 1, the system comprises a HPPO wastewater pretreatment unit, a hydrogen peroxide wastewater pretreatment unit, and a mixed acid adjusting unit 5, a catalytic reaction unit 6, an alkali-adding neutralization unit 7 and a flocculation precipitation unit 8 which are sequentially communicated;
wherein the mixed acid regulating unit 5 comprises an HPPO wastewater inlet H3 and a hydrogen peroxide wastewater inlet H4; the HPPO wastewater inlet H3 is communicated with an HPPO wastewater outlet of the HPPO wastewater pretreatment unit, and the hydrogen peroxide wastewater inlet H4 is communicated with a hydrogen peroxide wastewater outlet of the hydrogen peroxide wastewater pretreatment unit.
The utility model provides a HPPO waste water and hydrogen peroxide solution waste water combined treatment system, mix HPPO waste water and hydrogen peroxide solution waste water, utilize the peroxide in the hydrogen peroxide solution waste water to carry out catalytic oxidation reaction under the acid catalysis condition, both can eliminate the organic matter in the HPPO waste water, promote waste water biodegradability, peroxide solution waste water peroxide concentration has still been reduced by a wide margin, reach "treat waste with waste"'s purpose, the waste water that obtains through the combined treatment satisfies the requirement that gets into sewage treatment plant, and has good economic benefits, the expense at sewage treatment station is reduced by a wide margin.
In a specific embodiment, the mass ratio of the HPPO wastewater introduced into the HPPO wastewater pretreatment unit to the hydrogen peroxide wastewater introduced into the hydrogen peroxide wastewater pretreatment unit is 0.1 to 10:1; preferably 0.1-0.5, pH of the HPPO wastewater is 2-10, COD is 3000-20000 mg/L, BOD is 200-1000 mg/L, B/C (BOD/COD) is 0.01-0.12; the pH value of the hydrogen peroxide wastewater is 3-5, the COD is 500-2000 mg/L, the BOD is 0-25 g/L, and the B/C is 0-0.05.
In a specific embodiment, as shown in fig. 1, the hydrogen peroxide wastewater pretreatment unit includes a first homogenizing tank 1, a first oil separator 2, and a second oil separator 3, which are sequentially connected;
the first homogenizing tank 1 is provided with a hydrogen peroxide wastewater raw material inlet S1, and the hydrogen peroxide wastewater raw material inlet S1 is used for being communicated with a hydrogen peroxide wastewater source; the second oil separator 3 is provided with a hydrogen peroxide wastewater pretreatment outlet S4 to form a hydrogen peroxide wastewater outlet of the hydrogen peroxide wastewater pretreatment unit.
In a specific embodiment, as shown in fig. 1, the first oil separation device 2 is an oil separation tank, and a first sludge discharge port P1 is arranged at the bottom of the oil separation tank; the second oil separation device 3 is an air floatation oil removal device, and the upper part of the air floatation oil removal device is provided with a second sludge discharge port P2;
the air floatation oil removal device is selected from one or more of a cavitation air floatation device and a dissolved air floatation device, and preferably is the dissolved air floatation device.
In the present disclosure, the oil separation tank and the air flotation oil removal device are all structures conventionally selected in the field.
In one embodiment, the first oil separator 2 and the second oil separator 3 each independently comprise an oil removal aid; the oil removal auxiliary device comprises one or more of an air compressor, a booster pump and an oil scraper.
Specifically, as shown in fig. 1, hydrogen peroxide wastewater W1 enters a first homogenizing tank 1 through a hydrogen peroxide wastewater raw material inlet S1 for water quality adjustment, then enters a first oil separator 2 through a water outlet S2 and a water inlet S3 for treatment, the treated wastewater enters a second oil separator 3 for treatment, and the hydrogen peroxide wastewater treated by the second oil separator 3 flows out of a hydrogen peroxide wastewater pretreatment unit through a hydrogen peroxide wastewater pretreatment outlet S4; and the impurities deposited in the first oil separator 2 can be discharged through the first sludge discharge port P1, and the impurities (such as sludge) generated by air floatation in the second oil separator 3 due to the air floatation oil removing device is lighter than water and can be discharged through the second sludge discharge port P2 at the upper part of the second oil separator 3.
In one embodiment, the retention time of the hydrogen peroxide wastewater in the first homogenizing tank 1 is 12 to 72 hours, preferably 24 hours.
In one embodiment, as shown in fig. 1, the HPPO wastewater pretreatment unit comprises a second homogenization tank 4; the second homogenizing tank 4 is provided with an HPPO wastewater raw material inlet H1 and an HPPO wastewater pretreatment outlet H2, the HPPO wastewater raw material inlet H1 is used for being communicated with an HPPO wastewater raw material source, and the HPPO wastewater pretreatment outlet is formed as an HPPO wastewater outlet of the HPPO wastewater pretreatment unit.
Specifically, as shown in fig. 1, the HPPO wastewater W2 is introduced into the second homogenizing tank 4 through the HPPO wastewater raw material inlet H1 to adjust the water quality, and then is led out of the HPPO wastewater pretreatment unit through the HPPO wastewater pretreatment outlet H2.
In one embodiment, the residence time of the HPPO wastewater in the second homogenization tank 4 is between 12 and 72 hours, preferably 24 hours.
In one embodiment, as shown in fig. 1, the mixed acid adjusting unit 5 further comprises a first wastewater outlet H5.
In a preferred embodiment, the mixing and acid-adjusting unit 5 further comprises an acid solution adding port Y1, a first pH detecting device, a first adding device and a first stirring device;
wherein the probe of the first pH detection device is arranged inside the mixed acid regulating unit 5 and is used for detecting the pH value of the liquid inside the mixed acid regulating unit 5; the first medicine adding device is in signal connection with the first pH detection device and is used for adding acid into the mixed acid regulating unit 5 through the acid liquid medicine adding port Y1 according to the pH value detected by the first pH detection device;
the first stirring device is arranged inside the mixing and acid-regulating unit 5.
Specifically, the hydrogen peroxide wastewater from the hydrogen peroxide wastewater pretreatment unit enters a mixed acid regulating unit 5 through a hydrogen peroxide wastewater inlet, the HPPO wastewater from the HPPO wastewater pretreatment unit enters the mixed acid regulating unit 5 through an HPPO wastewater inlet H3, and acid liquor is added into the mixed acid regulating unit 5 through an acid liquor adding port Y1, a first pH detection device detects the pH value of liquid inside the mixed acid regulating unit 5 for detection, and a first medicine adding device adds acid into the mixed acid regulating unit 5 through the acid liquor adding port Y1 according to the pH value detected by the first pH detection device to control the pH value inside the mixed acid regulating unit 5 to be 3.0-4.0, and is provided with a first stirring device for stirring, wherein the first stirring device can be a mechanical stirring hydraulic mixing device; the treated wastewater flows out of the mixed acid adjusting unit 5 through a first wastewater outlet H5.
In the disclosure, the first pH detection device, the first dosing device and the first stirring device are all devices conventionally selected in the field; further, the first dosing device can adopt an automatic dosing device to control the acid liquor to be dosed according to the pH value signal so as to control the pH value in the mixed acid regulating unit 5 to be 3.0-4.0.
In one embodiment, the acid solution is selected from one or more of dilute sulfuric acid, hydrochloric acid and phosphoric acid, preferably sulfuric acid.
In one embodiment, as shown in fig. 1, the catalytic reaction unit 6 includes a first wastewater inlet H6 and a second wastewater outlet H7; the first wastewater inlet H6 is communicated with a first wastewater outlet H5 of the mixed acid adjusting unit 5.
In a preferred embodiment, the catalytic reaction unit 6 further comprises a catalyst dosing inlet Y2, a medicament dissolving tank, a second dosing device and a second stirring device;
the second dosing device is used for dosing an oxidant to the medicament dissolving tank according to the amount of the hydrogen peroxide wastewater introduced into the catalytic reaction unit 6;
the medicament dissolving tank is arranged inside the catalytic reaction unit 6;
the second stirring device is arranged inside the catalytic reaction unit 6; the second stirring device is selected from one or more of a hydraulic stirring device, a mechanical stirring device and an air stirring device.
In the present disclosure, the agent dissolving tank, the second dosing device and the second stirring device are all structural devices conventionally selected in the art.
Specifically, the treated wastewater from the mixed acid regulating unit 5 enters the catalytic reaction unit 6 through the first wastewater inlet H6, the catalyst is introduced into the catalytic reaction unit 6 through the catalyst feeding inlet Y2, the oxidant is fed into the reagent dissolving tank according to the amount of the hydrogen peroxide wastewater in the catalytic reaction unit 6, the oxidant is introduced into the reagent dissolving tank for dissolving, and meanwhile, a second stirring device is arranged in the catalytic reaction unit 6 for stirring. Further, the second medicine adding device can adopt a conventionally adopted automatic medicine adding device.
The catalyst and the oxidant adopted by the catalytic reaction unit in the present disclosure can adopt agents conventionally selected in the field; the catalytic reaction conditions may also be conventional in the art.
In a specific embodiment, the catalyst in the catalytic reaction unit 6 includes ferrous salt, preferably ferrous sulfate solution with mass concentration of 20% -30%; the oxidant can be one or more selected from hydrogen peroxide, hypochlorite and persulfate, hydrogen peroxide is preferred, and hydrogen peroxide in the introduced hydrogen peroxide wastewater can be used as the oxidant without additionally introducing the oxidant; the adding amount of the oxidant is determined according to the water amount of the hydrogen peroxide wastewater, preferably the adding amount is 0.25-2 times of the residual COD corresponding to the deduction of the concentration (according to the mass ratio of 0.5-2:1-2) of the peroxide in the hydrogen peroxide wastewater, and the adding amount of the catalyst is 1-8 times of the adding amount of the oxidant; the reaction time is 0.5 to 4 hours, preferably 1 hour.
In one embodiment, as shown in fig. 1, the alkali-adding neutralization unit 7 comprises a second wastewater inlet H8 and a third wastewater outlet H9; the second wastewater inlet H8 communicates with the second wastewater outlet H7 of the catalytic reaction unit 6.
In a preferred embodiment, the alkali adding and neutralizing unit 7 further comprises an alkali adding opening Y3, an alkali dissolving tank, a second pH detecting device and a third adding device;
the probe of the second pH detection device is arranged inside the alkali-adding neutralization unit 7 and is used for detecting the pH value of liquid inside the alkali-adding neutralization unit 7; the third medicine adding device is in signal connection with the second pH detection device and is used for adding alkali into the alkali adding neutralization unit 7 through the alkali medicine adding port according to the pH value detected by the second pH detection device.
Specifically, the wastewater from the catalytic oxidation of the catalytic reaction unit 6 enters the alkali-adding neutralization unit 7 through the second wastewater inlet H8, the pH value of the liquid inside the alkali-adding neutralization unit 7 detected by the second pH detection device is detected, and the third dosing device doses alkali into the alkali-adding neutralization unit 7 through the alkali dosing port Y3 according to the pH value detected by the second pH detection device to adjust the pH of the wastewater to be neutral, wherein the dosed alkali is added into the alkali dissolution tank for dissolution. Further, the third dosing device may employ a conventionally employed automatic dosing device.
In one embodiment, the alkali added by the alkali neutralization unit 7 can be NaOH or other alkali of the type conventional in the art.
In one embodiment, as shown in fig. 1, the flocculation unit 8 comprises a third waste water inlet H10 and a treated waste water outlet H11; a third waste water inlet H10 is communicated with a third waste water outlet H9 of the alkali-adding neutralization unit 7; the treated wastewater outlet H11 is used for being communicated with a biochemical treatment device.
The flocculation precipitation unit 8 is arranged in the device, so that the wastewater can be further purified, and the subsequent wastewater treatment in a biochemical treatment device is facilitated.
In a preferred embodiment, as shown in fig. 1, the flocculation unit 8 further comprises a precipitation aid dosing port Y4 and a third sludge discharge port P3; the third sludge discharge port P3 is arranged at the bottom of the flocculation precipitation unit 8;
the top of the flocculation precipitation unit 8 is also provided with an overflow weir to form a treated wastewater outlet H11.
Specifically, the wastewater from the alkali-adding neutralization unit 7 enters the flocculation precipitation unit 8 through a third wastewater inlet H10, and an auxiliary agent such as a coagulant and a flocculant is added into the flocculation precipitation unit 8 through a precipitation auxiliary agent adding port Y4 for precipitation purification treatment, and the obtained effluent W3 flows out through a treated wastewater outlet H11 and enters a subsequent treatment device, for example, a biochemical treatment device; the settled residue can be discharged through a third sludge discharge port P3 at the bottom of the flocculation precipitation unit 8, and can be dewatered and then subjected to subsequent treatment.
The coagulant and the flocculant adopted by the flocculation precipitation unit 8 in the disclosure can be of the types conventionally selected in the field, and the adding amount and the like can also be adjusted according to the actual situation.
In one embodiment, a coagulant and a flocculant are added into the flocculation precipitation unit 8; preferably, the coagulant is PAC, the adding amount is 50 mg/L-200 mg/L, the flocculant is PAM, and the adding amount is 1-10 mg/L, wherein the adding amount of the coagulant and the flocculant is calculated according to the amount of the wastewater to be treated in the flocculation precipitation unit 8.
In a specific embodiment, as shown in fig. 1, a combined treatment system for HPPO wastewater and hydrogen peroxide wastewater comprises an HPPO wastewater pretreatment unit, a hydrogen peroxide wastewater pretreatment unit, and a mixed acid adjusting unit 5, a catalytic reaction unit 6, an alkali-adding neutralization unit 7 and a flocculation precipitation unit 8 which are sequentially communicated;
wherein the mixed acid regulating unit 5 comprises an HPPO wastewater inlet H3 and a hydrogen peroxide wastewater inlet H4; the HPPO wastewater inlet H3 is communicated with an HPPO wastewater outlet of the HPPO wastewater pretreatment unit, and the hydrogen peroxide wastewater inlet H4 is communicated with a hydrogen peroxide wastewater outlet of the hydrogen peroxide wastewater pretreatment unit;
the hydrogen peroxide wastewater pretreatment unit comprises a first homogenizing tank 1, a first oil separation device 2 and a second oil separation device 3 which are sequentially communicated;
the first homogenizing tank 1 is provided with a hydrogen peroxide wastewater raw material inlet S1, and the hydrogen peroxide wastewater raw material inlet S1 is used for being communicated with a hydrogen peroxide wastewater source; the second oil separation device 3 is provided with a hydrogen peroxide wastewater pretreatment outlet S4 to form a hydrogen peroxide wastewater outlet of the hydrogen peroxide wastewater pretreatment unit; the first oil separation device 2 is an oil separation tank, and the bottom of the oil separation tank is provided with a first sludge discharge port P1; the second oil separation device 3 is an air floatation oil removal device, and the upper part of the air floatation oil removal device is provided with a second sludge discharge port P2; the air-floatation oil removal device is selected from one or more of a cavitation air floatation device and a dissolved air floatation device; the first oil separator 2 and the second oil separator 3 each independently comprise an oil removal auxiliary device; the oil removal auxiliary device comprises one or more of an air compressor, a booster pump and an oil scraper;
wherein the HPPO wastewater pretreatment unit comprises a second homogenization tank 4; the second homogenizing tank 4 is provided with an HPPO wastewater raw material inlet H1 and an HPPO wastewater pretreatment outlet H2, the HPPO wastewater raw material inlet H1 is used for being communicated with an HPPO wastewater raw material source, and the HPPO wastewater pretreatment outlet is formed as an HPPO wastewater outlet of the HPPO wastewater pretreatment unit;
wherein, the mixed acid regulating unit 5 also comprises a first wastewater outlet H5;
the catalytic reaction unit 6 comprises a first wastewater inlet H6 and a second wastewater outlet H7; the first wastewater inlet H6 is communicated with a first wastewater outlet H5 of the mixed acid regulating unit 5;
the alkali adding neutralization unit 7 comprises a second wastewater inlet H8 and a third wastewater outlet H9; the second wastewater inlet H8 is communicated with a second wastewater outlet H7 of the catalytic reaction unit 6;
the flocculation precipitation unit 8 comprises a third waste water inlet H10 and a treated waste water outlet H11; a third waste water inlet H10 is communicated with a third waste water outlet H9 of the alkali-adding neutralization unit 7; the treated wastewater outlet H11 is communicated with a biochemical treatment device;
the mixed acid regulating unit 5 also comprises an acid liquor dosing port Y1, a first pH detection device, a first dosing device and a first stirring device;
wherein the probe of the first pH detection device is arranged inside the mixed acid regulating unit 5 and is used for detecting the pH value of the liquid inside the mixed acid regulating unit 5; the first medicine adding device is in signal connection with the first pH detection device and is used for adding acid into the mixed acid regulating unit 5 through the acid liquid medicine adding port Y1 according to the pH value detected by the first pH detection device;
the first stirring device is arranged in the mixing and acid-regulating unit 5;
the catalytic reaction unit 6 also comprises a catalyst dosing inlet Y2, a medicament dissolving tank, a second dosing device and a second stirring device;
the second dosing device is used for dosing an oxidant to the medicament dissolving tank according to the amount of the hydrogen peroxide wastewater introduced into the catalytic reaction unit 6;
the medicament dissolving tank is arranged inside the catalytic reaction unit 6;
the second stirring device is arranged inside the catalytic reaction unit 6; the second stirring device is selected from one or more of a hydraulic stirring device, a mechanical stirring device and an air stirring device;
wherein, the alkali adding neutralization unit 7 also comprises an alkali adding opening Y3, an alkali dissolving tank, a second pH detection device and a third medicine adding device;
the probe of the second pH detection device is arranged in the alkali adding neutralization unit 7 and is used for detecting the pH value of liquid in the alkali adding neutralization unit 7; the third dosing device is in signal connection with the second pH detection device and is used for adding alkali into the alkali-adding neutralization unit 7 through the alkali dosing port according to the pH value detected by the second pH detection device;
wherein, the flocculation precipitation unit 8 also comprises a precipitation auxiliary agent feeding port Y4 and a third sludge discharge port P3; the third sludge discharge port P3 is arranged at the bottom of the flocculation precipitation unit 8;
the top of the flocculation precipitation unit 8 is also provided with an overflow weir to form a treated wastewater outlet H11.
The specific process flow in each processing unit is described in detail in the foregoing, and is not described herein again.
The technical solutions of the present disclosure are further described below with reference to specific embodiments.
Example 1
The embodiment is used for verifying the effect of the catalytic oxidation reaction carried out by combining the hydrogen peroxide wastewater and the HPPO wastewater.
The wastewater produced by HPPO in a chemical workshop of a petrochemical refinery and a matched hydrogen peroxide are taken, the BOD of the HPPO wastewater is only 0.07, and the BOD of the hydrogen peroxide wastewater containing high-concentration peroxide is 0, so that the requirement of entering a sewage treatment plant for centralized treatment cannot be met. Specifically, the surface 1 is the water quality condition of wastewater produced by HPPO in a chemical workshop of a petrochemical refinery and matched hydrogen peroxide wastewater produced during hydrogen peroxide production.
TABLE 1
In the catalytic oxidation reaction of the two waste water streams, the pH value of the waste water in the catalytic oxidation unit is controlled to be 3, the reaction time is 1h, the HPPO waste water and the hydrogen peroxide waste water are added according to different proportions to carry out a control test (see the following table 2), wherein a catalyst FeSO adopted in the catalytic oxidation reaction unit is 4 ·7H 2 The amount of O added was 0.5 times the COD concentration, and the experimental setup and results are shown in Table 2 below.
TABLE 2
As can be seen from the data in the above table 2, the biodegradability of the two kinds of wastewater can be greatly improved under the catalysis of ferrous sulfate by carrying out the proportional reaction of the HPPO wastewater and the hydrogen peroxide wastewater in different proportions, and the data show that the B/C can reach about 0.3 when the mixing proportion is 1:2, so that the biochemical treatment requirements (the B/C range of the biochemical treatment requirements is more than 0.2-0.3) are met, and the subsequent biochemical treatment can be carried out.
Example 2
The embodiment is used for illustrating the wastewater treatment effect of the combined treatment system for HPPO wastewater and hydrogen peroxide wastewater provided by the disclosure.
The processing system shown in fig. 1 specifically includes the following processes:
hydrogen peroxide wastewater W1 enters a first homogenizing tank 1 through a hydrogen peroxide wastewater raw material inlet S1 for water quality adjustment, then enters a first oil separator 2 for treatment through a water outlet S2 and a water inlet S3, the treated wastewater enters a second oil separator 3 for treatment, and the hydrogen peroxide wastewater treated by the second oil separator 3 flows out of a hydrogen peroxide wastewater pretreatment unit through a hydrogen peroxide wastewater pretreatment outlet S4; and impurities deposited in the first oil separator 2 can be discharged through the first sludge discharge port P1, and impurities floating in the second oil separator 3 can be discharged through the second sludge discharge port P2; wherein the mass ratio of the HPPO wastewater introduced into the HPPO wastewater pretreatment unit to the hydrogen peroxide wastewater introduced into the hydrogen peroxide wastewater pretreatment unit is 1:2; the water quality conditions of the HPPO wastewater and the hydrogen peroxide wastewater are shown in the table 1; the retention time of the hydrogen peroxide wastewater in the first homogenizing tank 1 is 12 hours;
introducing HPPO wastewater W2 into a second homogenizing tank 4 through an HPPO wastewater raw material inlet H1 for water quality adjustment, and then leading out an HPPO wastewater pretreatment unit through an HPPO wastewater pretreatment outlet H2; the retention time of the hydrogen peroxide wastewater in the first homogenizing tank 1 is 12 hours;
hydrogen peroxide wastewater from a hydrogen peroxide wastewater pretreatment unit enters a mixed acid regulating unit 5 through a hydrogen peroxide wastewater inlet, HPPO wastewater from the HPPO wastewater pretreatment unit enters the mixed acid regulating unit 5 through a PPO wastewater inlet H3, acid liquor is added into the mixed acid regulating unit 5 through an acid liquor adding port Y1, a first pH detection device detects the pH value of liquid inside the mixed acid regulating unit 5 and is used for detecting the pH value of the liquid inside the mixed acid regulating unit 5, and a first medicine adding device adds acid into the mixed acid regulating unit 5 through the acid liquor adding port Y1 according to the pH value detected by the first pH detection device to control the pH value inside the mixed acid regulating unit 5 to be 3.0, and is provided with a first stirring device for stirring, wherein the first stirring device can be a mechanical stirring hydraulic mixing device; the treated wastewater flows out of the mixed acid regulating unit 5 through a first wastewater outlet H5; the first dosing device can adopt a conventionally adopted automatic dosing device; wherein the acid solution is sulfuric acid;
the treated wastewater from the mixed acid regulating unit 5 enters a catalytic reaction unit 6 through a first wastewater inlet H6, a catalyst is introduced into the catalytic reaction unit 6 through a catalyst feeding inlet Y2, an oxidant is fed into a medicament dissolving tank according to the amount of hydrogen peroxide wastewater in the catalytic reaction unit 6, the oxidant is introduced into the medicament dissolving tank for dissolving, and a second stirring device is arranged in the catalytic reaction unit 6 for stirring; the second dosing device can adopt a conventionally adopted automatic dosing device; wherein the types and the adding amounts of the catalyst and the oxidant are the same as those in the example 1, and the reaction conditions are also the same as those in the example 1;
the wastewater from the catalytic oxidation of the catalytic reaction unit 6 enters the alkali-adding neutralization unit 7 through a second wastewater inlet H8, the pH value of the liquid in the alkali-adding neutralization unit 7 is detected by a second pH detection device, and the third dosing device adds alkali into the alkali-adding neutralization unit 7 through an alkali dosing port Y3 according to the pH value detected by the second pH detection device to adjust the pH value of the wastewater to be neutral, wherein the added alkali is added into an alkali dissolving tank for dissolving, and the third dosing device can adopt a conventionally adopted automatic dosing device; wherein the alkali is NaOH;
the wastewater from the alkali-adding neutralization unit 7 enters a flocculation precipitation unit 8 through a third wastewater inlet H10, coagulant, flocculant and the like are added into the flocculation precipitation unit 8 through a precipitation auxiliary agent feeding port Y4 for precipitation and purification treatment, and the obtained effluent W3 flows out through a treated wastewater outlet H11 and then enters a biochemical treatment device; the residue obtained by precipitation can be discharged through a third sludge discharge port P3 at the bottom of the flocculation precipitation unit 8, and can be dewatered and then subjected to subsequent treatment; wherein, the coagulant is PAC, the dosage is 100mg/L, the flocculant is PAM, the dosage is 2mg/L, and the dosage of the coagulant and the flocculant is calculated according to the amount of the wastewater to be treated in the flocculation precipitation unit 8.
Through detection, the quality of the treated wastewater (effluent W3) obtained by adopting the combined treatment system of the HPPO wastewater and the hydrogen peroxide wastewater provided by the disclosure comprises the following steps: after the reaction, the COD is 3200mg/L, the BOD is 1070mg/L and the B/C is 0.33, thereby meeting the biochemical treatment requirement and being capable of carrying out subsequent biochemical treatment.
The preferred embodiments of the present disclosure are described in detail above with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details in the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. The combined treatment system for the HPPO wastewater and the hydrogen peroxide wastewater is characterized by comprising an HPPO wastewater pretreatment unit, a hydrogen peroxide wastewater pretreatment unit, and a mixed acid regulating unit (5), a catalytic reaction unit (6), an alkali adding neutralization unit (7) and a flocculation precipitation unit (8) which are sequentially communicated;
wherein the mixed acid regulating unit (5) comprises an HPPO wastewater inlet (H3) and a hydrogen peroxide wastewater inlet (H4); the HPPO wastewater inlet (H3) is communicated with an HPPO wastewater outlet of the HPPO wastewater pretreatment unit, and the hydrogen peroxide wastewater inlet (H4) is communicated with a hydrogen peroxide wastewater outlet of the hydrogen peroxide wastewater pretreatment unit.
2. The system of claim 1, wherein the hydrogen peroxide wastewater pretreatment unit comprises a first homogenizing tank (1), a first oil separator (2) and a second oil separator (3) which are sequentially communicated;
the first homogenizing tank (1) is provided with a hydrogen peroxide wastewater raw material inlet (S1), and the hydrogen peroxide wastewater raw material inlet (S1) is communicated with a hydrogen peroxide wastewater source; the second oil separation device (3) is provided with a hydrogen peroxide wastewater pretreatment outlet (S4) to form a hydrogen peroxide wastewater outlet of the hydrogen peroxide wastewater pretreatment unit.
3. A system according to claim 1, characterized in that the HPPO wastewater pretreatment unit comprises a second homogenization tank (4); the second homogenizing tank (4) is provided with an HPPO wastewater raw material inlet (H1) and an HPPO wastewater pretreatment outlet (H2), the HPPO wastewater raw material inlet (H1) is used for being communicated with an HPPO wastewater raw material source, and the HPPO wastewater pretreatment outlet is formed as an HPPO wastewater outlet of the HPPO wastewater pretreatment unit.
4. The system according to claim 2, characterized in that the first oil separator (2) is an oil separator, the bottom of which is provided with a first sludge discharge (P1); the second oil separation device (3) is an air floatation oil removal device, and a second sludge discharge port (P2) is formed in the upper part of the air floatation oil removal device;
the air floatation oil removal device is selected from one or more of a cavitation air floatation device and a dissolved air floatation device.
5. A system according to claim 2, characterized in that the first oil separator (2) and the second oil separator (3) each independently comprise an oil removal aid; the oil removal auxiliary device comprises one or more of an air compressor, a booster pump and an oil scraper.
6. The system according to claim 1, wherein the mixed acid adjusting unit (5) further comprises a first wastewater outlet (H5);
the catalytic reaction unit (6) comprises a first wastewater inlet (H6) and a second wastewater outlet (H7); the first wastewater inlet (H6) is communicated with a first wastewater outlet (H5) of the mixed acid regulating unit (5);
the alkali-adding neutralization unit (7) comprises a second wastewater inlet (H8) and a third wastewater outlet (H9); the second wastewater inlet (H8) is communicated with a second wastewater outlet (H7) of the catalytic reaction unit (6);
the flocculation precipitation unit (8) comprises a third waste water inlet (H10) and a treated waste water outlet (H11); the third waste water inlet (H10) is communicated with a third waste water outlet (H9) of the alkali-adding neutralization unit (7); the treated wastewater outlet (H11) is used for being communicated with a biochemical treatment device.
7. The system according to claim 6, wherein the mixed acid adjusting unit (5) further comprises an acid liquid adding port (Y1), a first pH detection device, a first adding device and a first stirring device;
the probe of the first pH detection device is arranged in the mixed acid regulating unit (5) and is used for detecting the pH value of liquid in the mixed acid regulating unit (5); the first medicine adding device is in signal connection with the first pH detection device and is used for adding acid into the mixed acid adjusting unit (5) through the acid liquid adding port (Y1) according to the pH value detected by the first pH detection device;
the first stirring device is arranged inside the mixing and acid-regulating unit (5).
8. The system according to claim 6, wherein the catalytic reaction unit (6) further comprises a catalyst dosing inlet (Y2), a medicament dissolving tank, a second dosing device and a second stirring device;
the second dosing device is used for dosing an oxidant to the medicament dissolving tank according to the amount of the hydrogen peroxide wastewater introduced into the catalytic reaction unit (6);
the medicament dissolving tank is arranged inside the catalytic reaction unit (6);
the second stirring device is arranged inside the catalytic reaction unit (6); the second stirring device is selected from one or more of a hydraulic stirring device, a mechanical stirring device and an air stirring device.
9. The system according to claim 6, wherein the alkali adding neutralization unit (7) further comprises an alkali adding opening (Y3), an alkali dissolving tank, a second pH detection device and a third adding device;
the probe of the second pH detection device is arranged inside the alkali-adding neutralization unit (7) and is used for detecting the pH value of liquid inside the alkali-adding neutralization unit (7); and the third medicine adding device is in signal connection with the second pH detection device and is used for adding alkali into the alkali adding neutralization unit (7) through the alkali adding opening according to the pH value detected by the second pH detection device.
10. The system according to claim 6, wherein the flocculation unit (8) further comprises a sedimentation aid dosing port (Y4) and a third sludge discharge port (P3); the third sludge discharge port (P3) is arranged at the bottom of the flocculation precipitation unit (8);
the top of the flocculation precipitation unit (8) is also provided with an overflow weir to form the treated wastewater outlet (H11).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117509873A (en) * | 2023-11-16 | 2024-02-06 | 江苏嘉宏新材料有限公司 | Epoxypropane waste water and hydrogen peroxide waste water combined treatment system |
| CN117566889A (en) * | 2023-11-16 | 2024-02-20 | 江苏嘉宏新材料有限公司 | Epoxypropane wastewater and hydrogen peroxide wastewater combined removal system and treatment process |
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2022
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117509873A (en) * | 2023-11-16 | 2024-02-06 | 江苏嘉宏新材料有限公司 | Epoxypropane waste water and hydrogen peroxide waste water combined treatment system |
| CN117566889A (en) * | 2023-11-16 | 2024-02-20 | 江苏嘉宏新材料有限公司 | Epoxypropane wastewater and hydrogen peroxide wastewater combined removal system and treatment process |
| CN117509873B (en) * | 2023-11-16 | 2024-06-04 | 江苏嘉宏新材料有限公司 | Epoxypropane waste water and hydrogen peroxide waste water combined treatment system |
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